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All cable core symbols with a given item designation (cable number) together specifies the connected cable cores of the cable in question.

 

In addition to that, several unused - unconnected - cable cores may exist in the cable. They are called spare cores.

 

A cable core symbol can also be placed on a line which does not constitute a connection in a proper meaning, for instance on a line with one end connected to a symbol but the other not connected at all, ending in nowhere. When the cable core list is created, cable cores like that are in fact included and treated as cable cores physically connected in one end only. A common example of that is a shield, which is often treated as a cable core and which frequently is connected in one end only.

 

The analysis of which spare cores (cable cores not visible in the circuit diagram) that exist, uses data from the catalogue. The main cable symbol has an index which refers to the catalogue where the cable type in question is defined. The Limit field specifies the number of cores for the cable. In the catalogue, the cable is also associated with a numbering algorithm. The algorithm defines how these cable cores should be numbered. Thereby it is defined exactly how many cores the cable has, which numbers these cores have, and in which order they should be presented. This can be compared to the cable cores that are present in the circuit diagram. According to the definition, an existing cable core which does not have a corresponding cable core symbol, is a spare core. Cable core symbols which specify cable core numbers that are not part of the associated numbering algorithm, are seen as deviant core numbers. Such cable cores are added to the end of the cable in the cable core list, below all cable cores that are valid according to the numbering algorithm.